The Screw,assembled Washer, cataloged under National Stock Number 5305-01-666-5501, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 27 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-666-5501 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN |
| Fastener Length | 0.593 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Secondary Washer Relationship to Primary Washer | NOT IDENTICAL |
| Surface Treatment Document and Classification | AMS 2700, METHOD 1, CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE FASTENER |
| Surface Treatment Document and Classification | AMS 2700, METHOD 1, CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE PRIMARY WASHER |
| Primary Washer Outside Diameter | 0.213 INCHES MINIMUM AND 0.223 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763 FED SPEC ALL MATERIAL RESPONSES FASTENER |
| Material Document and Classification | AMS 5516 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5513 ASSN STD 2ND MATERIAL RESPONSE PRIMARY WASHER |
| Secondary Washer Style | SPLIT HELICAL RING |
| Nominal Thread Diameter | 0.112 INCHES IN |
| Head Style | PAN |
| Primary Washer Style | FLAT |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.013 INCHES MINIMUM AND 0.019 INCHES MAXIMUM IN |
| Specification/standard Data | 80205-NAS1301 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Secondary Washer Outside Diameter | 0.212 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE PRIMARY WASHER |
| Surface Treatment | PASSIVATE FASTENER |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 2A A |
| Secondary Washer Material Thickness | 0.025 INCHES NOMINAL IN |
| Thread Quantity Per Inch | 40 |
| Material | STEEL COMP 302 OR STEEL COMP 304 FASTENER |
| Material | STEEL COMP 302 OR STEEL COMP 304 PRIMARY WASHER |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Washer Quantity | 2 |
| Head Diameter | 0.205 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| NAS1301C4-10 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-666-5501 is a Screw,assembled Washer, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-666-5501: Head Height: 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN; Fastener Length: 0.593 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN; Secondary Washer Relationship to Primary Washer: NOT IDENTICAL; Surface Treatment Document and Classification: AMS 2700, METHOD 1, CLASS 4 ASSN STD SINGLE TREATMENT RESPONSE FASTENER. 27 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.